Cutting Slope Anchor (Cable) Stress Evolution And Seismic Response Law

Using pre-stress anchor for slope anchoring is a major way of rock-soil anchoring, it has gradually applied in many engineering like the highway, railway, architectural, hydraulic engineering etc, as a kind of economical、practical and effective way of rock-soil anchoring, the development of pre-stressing anchor technology has decades of history, but to the theoretical study and practical design is far behind the engineering practice. Especially the evolution of anchor stress and the response research of anchor seismic are relatively weak.The thesis combines the national natural science funds (50874085)"The reinforced mechanism and design method of slope reinforce by dispersed pressure of anchor cable "and and science and technology plan of GuangDong projects (63123)" The high and steep slope instability prediction and major treatment techniques of highway ", use prestressed anchor bolt and normal anchor as research object, the numerical simulation method was used to systematic study the discipline of anchor cable force which caused by different location of highway slope under earthquake.First, the paper summarized anchorage mechanism of anchor (cable) and the slope anchorage force analysis are reviewed under seismic action of earthquake. Second, this paper used the numerical simulation method to analyze the change rules of prestressed anchor (cable) force in different high (30-70meters) soil slope of highway., and the results show that: the anchor (cable) force of the slope in different locations is different, one step contain3anchor cables, the uppest one,the middle one and the downest one, and the middle prestress value most; Different steps but the same location anchor (cable) with the slope height increase prestressed show decreaseing trend; The cable located in the slope toe (cable) prestress value the most; as construction proceeding in highway slope, most of the prestressed anchor (cable) have prestress loss, but the middle location of slope steps anchor (cable) stress are increasing, and with the slope’s attitude increase,the number of anchor which force bigger than the initial prestress are increased. Finally, this paper used numerical simulation method analyzed the the action of slope prestressed anchor stress dynamic response under earthquake, and the results showed that the anchor force change law in earthquake and the anchor force change law without earthquake condition are similar,3different anchor cable in the same step, the middle one had the maximum peak axial force; Different steps but the same location anchor (cable) with the slope height increase prestressed show decreaseing trend, the biggest axial force of slope anchor appeard in the slope toe position. In the seven earthquake and eight earthquake process anchor axial force changed little, in9levels earthquake motion process in slope feet of anchor’s cable axial force increase obviously, but with the increase of slope height and the axial force of the anchor stay almost unchangeable. With the slope attitude increases,3three anchor cabl in slope foot step, the downmost one anchor’s axial force is the largest.